The KY posters may be able to confirm this, but my impression is that this race is slipping away from Beshear at the last minute.
Cameron has been far more on message in recent days, relentlessly nationalizing the race and painting Beshear as a national Democrat on two of the most unpopular political stances in the state: his support for Joe Biden and his support for draconian COVID lockdowns.
Previously, Beshear had managed to put Cameron on the defensive on abortion, his ties to Bevin, etc. while Cameron's own attacks were comparatively weak (e.g. on trans rights), but that seems to have changed, and it’s not good for Beshear.
Might turn into another example of "incumbent wishing the election had been held one week earlier."
Inb4 someone says "MUH WHITMER" "MUH GRISHAM"